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Mud cake permeability of OBM with different weighting agents.
| mud cake permeability (10−3 µm2) |
||||
|---|---|---|---|---|
| dosage (g) | standard barite | submicron barite | superfine manganese ore | compound (1 : 1) |
| 200 | 0.9542 | 2.4369 | 2.2256 | 0.3698 |
| 400 | 1.4523 | 6.8585 | 5.3675 | 0.6847 |
| 600 | 2.8965 | 9.1385 | 10.6984 | 0.9873 |
